We should account for stacks regardless of stack size. Move it into
account_kernel_stack.
Fixes: 12580e4b54ba8 ("mm: memcontrol: report kernel stack usage in cgroup2 memory.stat")
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
---
kernel/fork.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/kernel/fork.c b/kernel/fork.c
index 95bebde59d79..59e52f2120a3 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -165,20 +165,12 @@ static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
struct page *page = alloc_kmem_pages_node(node, THREADINFO_GFP,
THREAD_SIZE_ORDER);
- if (page)
- memcg_kmem_update_page_stat(page, MEMCG_KERNEL_STACK,
- 1 << THREAD_SIZE_ORDER);
-
return page ? page_address(page) : NULL;
}
static inline void free_thread_info(struct thread_info *ti)
{
- struct page *page = virt_to_page(ti);
-
- memcg_kmem_update_page_stat(page, MEMCG_KERNEL_STACK,
- -(1 << THREAD_SIZE_ORDER));
- __free_kmem_pages(page, THREAD_SIZE_ORDER);
+ free_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER);
}
# else
static struct kmem_cache *thread_info_cache;
@@ -227,6 +219,11 @@ static void account_kernel_stack(struct thread_info *ti, int account)
mod_zone_page_state(zone, NR_KERNEL_STACK,
THREAD_SIZE / PAGE_SIZE * account);
+
+ /* All stack pages belong to the same memcg. */
+ memcg_kmem_update_page_stat(
+ virt_to_page(ti), MEMCG_KERNEL_STACK,
+ account * (THREAD_SIZE / PAGE_SIZE));
}
void free_task(struct task_struct *tsk)
--
2.7.4
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